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MotoLibrary Score
34/100Commuter
Power/Weight
0.1 hp/kg
Torque
10 Nm
Engine
125 ccm
Technical Overview
2021 Yamaha Mio S Technical Analysis & Specification Breakdown
Positioned in Yamaha's scooter motorcycle lineup, the 2021 Yamaha Mio S relies on a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 9.4 HP (6.9 kW) at 8,000 rpm while maximum torque reaches 9.6 Nm (7.1 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 75.2 HP per liter and a 2,500 rpm working window between peak torque (5,500 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Mio S measures 94 kg (207 lbs) dry, translating to a power-to-weight ratio of 0.1 HP/kg (10 kg per horsepower). Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,260 mm (49.6 in) wheelbase engineered for quick, flickable steering geometry. The 4.2-liter (1.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
75.2 HP/L
Power-to-Weight
0.1 HP/kg (10 kg/HP)
Power Band Window
5,500–8,000 rpm
Standover Height
750 mm (29.5 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power9.4 HP (6.9 kW)) @ 8000 RPM
Torque9.6 Nm (1.0 kgf-m or 7.1 ft.lbs) @ 5500 RPM
Compression9.5:1
Bore x Stroke52.0 x 57.9 mm (2.0 x 2.3 inches)
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDC-C.D.I
LubricationWet Sump
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchCentrifugal automatic
Chassis
Frame TypeSteel tube underbone
Rake26.5°
Trail100 mm (3.9 inches)
Front SuspensionTelescopic fork
Rear SuspensionUnit swingarm
Wheelbase1260 mm (49.6 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre80/80-14
Rear Tyre100/70-14
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight94.0 kg (207.2 pounds)
Power/Weight0.0999 HP/kg
Seat Height750 mm (29.5 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
